Celebrating 50 years of the beloved educational children’s series, the 16 new stamps feature several familiar faces from the show like Big Bird, Bert, Ernie, Cookie Monster, Oscar the Grouch, Snuffleupagus, Grover, Abby Cadabby, The Count, Rosita, Zoe — and of course, Elmo.

“For the last 50 years, [Sesame Street] has provided educational programming and entertainment for generations of children throughout the country and around the world,” USPS said in the press release of their inspiration behind the new stamp series.

Alongside the Sesame Street collection comes one bearing the visage of the animal kingdom’s most fearsome (albeit very extinct) member: the Tyrannosaurus rex.

Designed by Art Director Greg Breeding and scientist and paleoartist Julius T. Csotonyi, the four stamps depict the many sides of the T. Rex, from its innocence in youth to its growth into a hunter and predator. The last design shows how we know the T. Rex today, outside of movies and television: in its fossil form.

USPS explains in the press release that the young-dinosaur design is based on a real discovery in Montana, calling it “one of the most studied and important specimens ever found” that will soon be displayed as part of an exhibit inside the Smithsonian Institution’s National Museum of Natural History in Washington, D.C.

A third set of stamps, Spooky Silhouettes, features four Halloween-themed designs by Breeding and artist Tyler Lang — a cat, ghosts, a spider and bats — that “offer fun, frightful scenes that symbolize this annual celebration,” USPS says in the press release.

USPS has yet to reveal when the new stamps will be available, but promises their distribution is set for this year.

Sesame Street will celebrate the 50th anniversary of its first episode on Nov. 10.